*{
    padding: 0;
    margin: 0;
    font-family: "Microsoft YaHei";
    color:rgb(66, 66, 66);
}
a {
    text-decoration: none;
}
p{
    display: inline-block;
}
h1,h2,h3,h4,h5,h6{
    font-weight: normal;
}
ul li{
    list-style-type: none;
}
body{
    background-color: black;
}
.backgroundImage{
    width: 100%;
    height: 100%;
    background:transparent url("../image/微信图片_20200923112753.jpg") center center no-repeat;
    filter:blur(20px);
    background-size:100% 100%;
    z-index: -1;
    position: absolute;
}
.content{
    width: 100%;
    height: 100%;
    text-align: center;
}
#classroombtn{
    width: 100px;
    height: 35px;
    font-size: 20px;
    line-height: 35px;
    border: none;
    box-shadow: 0 0 10px rgb(66, 66, 66);
}
#classroombtn:hover{
    background-color: rgb(216, 216, 216);
}